WO2006008795A1 - 半導体装置の製造方法 - Google Patents
半導体装置の製造方法 Download PDFInfo
- Publication number
- WO2006008795A1 WO2006008795A1 PCT/JP2004/010205 JP2004010205W WO2006008795A1 WO 2006008795 A1 WO2006008795 A1 WO 2006008795A1 JP 2004010205 W JP2004010205 W JP 2004010205W WO 2006008795 A1 WO2006008795 A1 WO 2006008795A1
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- wafer
- layer
- forming
- metal
- semiconductor wafer
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- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/01—Chemical elements
- H01L2924/01079—Gold [Au]
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/01—Chemical elements
- H01L2924/01082—Lead [Pb]
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/013—Alloys
- H01L2924/014—Solder alloys
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L2924/00—Indexing scheme for arrangements or methods for connecting or disconnecting semiconductor or solid-state bodies as covered by H01L24/00
- H01L2924/15—Details of package parts other than the semiconductor or other solid state devices to be connected
- H01L2924/181—Encapsulation
Definitions
- the present invention relates to a method for manufacturing a semiconductor device, and more particularly to a method for manufacturing a semiconductor device including a back surface grinding process for thinning a wafer in a wafer level package in which a plurality of devices are built.
- semiconductor device refers to an individual semiconductor chip (device) after being cut and divided from a wafer unless otherwise defined. It also refers to individual semiconductor elements (devices) that have been built in and have not yet been cut and divided.
- CSP chip size package
- a passivation film (insulating film) as a protective film is formed on the surface of a semiconductor wafer on which a device is built, and the insulating film is formed on the insulating film.
- a rewiring layer (rewiring pattern) is formed to connect the wiring layer (electrode pad) of each device to the outside of the package through a via hole formed in a required portion of the device.
- a metal post is provided in the formation portion, and the entire surface on which the methanol post is formed is sealed with a sealing resin (but the top of the metal post is exposed), and the metal post Metal bumps as external connection terminals are joined to the top.
- a tape for protecting the pattern surface (hereinafter referred to as “BG tape” for the sake of convenience) is applied during back grinding.
- BG tape a tape for protecting the pattern surface
- a special laminator for attaching the BG tape and a dedicated remover for removing the BG tape after wafer back grinding are required.
- Tape was also needed.
- the BG tape used for backside grinding also has a function for keeping the surface on which the pattern is formed flat. For this reason, the BG tape is generally of a thick film type that can absorb surface irregularities.
- Patent Document 1 As described above, as a technique related to the back surface grinding process for reducing the thickness of the wafer, for example, there is a technique in which the back surface of the wafer is ground after resin sealing (for example, Patent Document 1,
- Patent Document 1 Japanese Patent Laid-Open No. 2002-270720
- Patent Document 2 JP-A-2002-231854
- the conventional wafer level package manufacturing process requires a thick film type BG tape in the process related to the wafer back surface grinding process. Since this thick film type BG tape is very expensive, a dedicated laminator and a dedicated remover (including a stripping tape) are also indispensable. This was a major obstacle in terms of cost (increased manufacturing costs).
- the wafer back surface grinding process is performed at the first stage in the manufacturing process of the wafer level package, and it is necessary to process all subsequent processes in a thin wafer state (thin wafer state). Therefore, there was a high possibility that a fatal defect called “wafer cracking” would occur. [0010] In order to cope with this, for example, a force that can be considered to make it possible to handle the thin wafer so that the wafer is not cracked by devising the holding and transport mechanism of the apparatus transport system. In this case, there was a problem when the cost related to the equipment transport system increased.
- Another method for avoiding wafer cracking due to processing in a thin wafer state is to use the wafer backside grinding process as late as possible in the wafer level package manufacturing process (ideally, It is conceivable to do this at the final stage. For example, if the wafer back surface grinding process is performed after the resin sealing is performed in the final assembly process, at least the wafer crack caused by the process in the thin wafer state can be avoided.
- the wafer back surface grinding process is performed after resin sealing, there is a possibility that the wafer cracks due to another cause. That is, when resin sealing is performed, for example, as shown in FIG. 10 (a), the mold resin (19) diffuses to the outer peripheral portion of the wafer (30), and the diffused mold resin protrudes to the wafer edge portion and the back surface of the wafer. (In other words, the mold resin protrudes from the back surface of the wafer.) If the wafer back surface grinding process is performed in this state, the resin enters the grinding wheel that should originally polish only the wafer material (silicon). This can cause clogging, which prevents smooth polishing and can break the wafer in some cases. Therefore, unless some measures are taken, it is not appropriate to perform wafer backside grinding after resin sealing.
- a film layer for warping correction for example, an insulating resin film made of epoxy resin, silicone resin, polyimide resin, etc.
- a film layer for warping correction for example, an insulating resin film made of epoxy resin, silicone resin, polyimide resin, etc.
- An object of the present invention is to provide a method of manufacturing a semiconductor device that can prevent wafer breakage and contribute to a reduction in manufacturing cost in realizing a thin wafer level package.
- the object of the present invention is to correct wafer warpage and reduce the warpage correction layer on the back surface as a non-permanent film and realize various reliability tests. It is an object of the present invention to provide a method for manufacturing a semiconductor device that can eliminate the need for a semiconductor device.
- the electrode pad of each device is exposed on the surface of the semiconductor wafer on which a plurality of devices are formed.
- the wafer back surface grinding is performed at a relatively later stage (stage immediately after forming the metal post) in the wafer level package manufacturing process. Since the semiconductor wafer can be processed in a thick state (thick wafer state) until the stage of forming the metal post, the conventional technology is used to reduce the thickness of the wafer level package. It is possible to prevent the occurrence of “wafer break”, which is a fatal defect as described above.
- the wafer surface (the surface on which the pattern is formed) is almost flat due to the surface of the metal post and the surface of the resist layer immediately before performing the wafer back surface grinding process.
- the electrode pads of the devices are exposed on the surface of the semiconductor wafer on the side where a plurality of devices are formed.
- a step of forming a Jung resist layer, a step of forming a rewiring layer on the metal thin film using the resist layer as a mask, and a side opposite to the side where the rewiring layer of the semiconductor wafer is formed Grinding the side surface to reduce the thickness to a predetermined thickness, removing the resist layer, and then forming a metal post in the terminal formation portion of the rewiring layer; and Removing the exposed metal thin film, exposing the top of the metal post and sealing the wafer surface with a sealing resin; and on the top of the metal post.
- the wafer back surface grinding process is performed at a relatively later stage (stage immediately after the formation of the rewiring layer) in the manufacturing process of the wafer level package. Since processing can be performed in a thick wafer state until the stage of forming the rewiring layer, wafer cracking can be prevented. Also, just before the wafer backside grinding process is performed, the wafer surface is almost flat due to the surface of the rewiring layer and the surface of the resist layer. This eliminates the need for a special laminator and special limono (including peeling tape), which contributes to reducing manufacturing costs.
- the insulating film is formed on the surface of the semiconductor wafer on the side where a plurality of devices are formed so that the electrode pads of each device are exposed.
- a step of thinning to a predetermined thickness, a step of forming a heat-resistant film layer on the thinned surface of the semiconductor wafer, and a top portion of the metal post after removing the resist layer Exposing the surface of the wafer with a sealing resin, bonding a metal bump to the top of the metal post, and bonding the semiconductor wafer to the metal bump into the semiconductor wafer.
- the step of cutting the semiconductor wafer along a line defining the area of each device is bonded and mounted on the support member, the step of cutting the semiconductor wafer along a line defining the area of each device; and And a step of picking up each of the devices while being adhered onto a support member.
- the method of manufacturing a semiconductor device according to the second embodiment, the method according to the first embodiment described above.
- the wafer back surface grinding is performed at a relatively later stage (stage immediately after forming the metal post) in the wafer level package manufacturing process. Since the film layer having heat resistance is formed on the back surface of the semiconductor wafer after the wafer back surface grinding and before the resist layer is removed, the film layer is a reinforcing layer against wafer cracking after this step. Function as. In other words, almost all processes can be made to flow in a thick wafer state, so that the risk of wafer cracking can be further reduced compared to the case of the first embodiment described above.
- the film layer formed on the back surface of the semiconductor wafer plays a role of holding the semiconductor wafer flat so as not to cause warpage of the semiconductor wafer when resin sealing with heat treatment is performed at a later stage. Further, this film layer is peeled off from the interface of each device while being adhered on the support member at the stage of the final pick-up process. In other words, since the film layer formed on the back side of the wafer for warping correction can be finally removed, there is no need to leave it as a permanent film as in the past, and as a result, various reliability tests (adhesion with wafers) No need to perform reliability tests.
- the insulating film is formed on the surface of the semiconductor wafer on the side where a plurality of devices are formed so as to have an opening through which the electrode pad of each device is exposed. Forming a conductor layer patterned in a desired shape so as to cover the opening from which the electrode pad is exposed, and forming a terminal of the conductor layer on the conductor layer.
- a method for manufacturing a semiconductor device is provided.
- the electrode pads of the devices are exposed on the surface of the semiconductor wafer on which the plurality of devices are formed.
- the resin that diffuses to the outer periphery of the semiconductor wafer when resin sealing is performed can be dropped into a groove formed in a ring shape along the wafer edge. Therefore, the protrusion of the resin to the back surface of the wafer can be suppressed.
- the resin sealing process after the resin sealing process that could not be achieved until now without causing the wafer cracking caused by the protrusion of the resin as seen in the prior art. Wafer backside grinding can be realized, and almost all processes can be made to flow in a thick wafer state. This further reduces the risk of wafer cracking. That power S.
- FIG. 1 is a cross-sectional view schematically showing a configuration of a semiconductor device having a CSP structure according to a first embodiment of the present invention.
- FIG. 2 is a cross-sectional view showing a manufacturing process (No. 1) of the semiconductor device of FIG.
- FIG. 3 is a cross-sectional view showing a manufacturing process (2) subsequent to the manufacturing process of FIG. 2.
- FIG. 4 is a cross-sectional view showing a manufacturing step (No. 3) subsequent to the manufacturing step of FIG. 3.
- FIG. 4 is a cross-sectional view showing a manufacturing step (No. 3) subsequent to the manufacturing step of FIG. 3.
- FIG. 5 is a cross-sectional view (partially a perspective view) showing a manufacturing process (No. 4) subsequent to the manufacturing process of FIG.
- FIG. 6 is a cross-sectional view schematically showing a configuration of a semiconductor device having a CSP structure according to a second embodiment of the present invention.
- FIG. 7 is a cross-sectional view showing a manufacturing process (No. 1) of the semiconductor device of FIG. 6.
- FIG. 7 is a cross-sectional view showing a manufacturing process (No. 1) of the semiconductor device of FIG. 6.
- FIG. 8 is a cross-sectional view showing a manufacturing process (2) subsequent to the manufacturing process of FIG. 7.
- FIG. 9 is a cross-sectional view showing a manufacturing step (part 3) subsequent to the manufacturing step of FIG. 8.
- FIG. 9 is a cross-sectional view showing a manufacturing step (part 3) subsequent to the manufacturing step of FIG. 8.
- FIG. 10 is a cross-sectional view showing a part of the manufacturing process of the semiconductor device according to the third embodiment of the present invention.
- FIG. 11 is a diagram for explaining the processing of the wafer edge portion performed in step (b) of FIG.
- FIG. 12 is a cross-sectional view showing a part of the manufacturing process according to a modification of the embodiment of FIG. BEST MODE FOR CARRYING OUT THE INVENTION
- FIG. 1 schematically shows a cross-sectional structure of a semiconductor device having a CSP structure according to a first embodiment of the present invention.
- reference numeral 10 denotes a semiconductor device (CSP) according to the present embodiment
- 11 denotes a silicon (Si) substrate on which a device is formed
- this silicon substrate 11 is a semiconductor (silicon) wafer described later. This is a part of the cut (divided) c.
- 12 is an electrode pad defined by a partial region of the wiring pattern formed on the device
- 13 is a protective film formed on one surface (upper surface in the illustrated example) of the silicon substrate 11.
- the barrier metal layer 19 is a sealing formed so as to cover the entire surface of the silicon substrate 11 on which the metal post 17 is formed (however, the top of the metal post 17 (barrier metal layer 18) is exposed).
- Resin layer, 20 is a solder bump as an external connection terminal joined to the top of the exposed metal post 17 (barrier metal layer 18), 21 is the other side of the silicon substrate 11 (the lower side in the example shown) Wafer crack prevention formed on Shows the insulating resin layer for reinforcing for.
- the material and thickness of each member will be omitted here, and will be described as appropriate in the manufacturing method described later.
- FIG. 5 (d) is an enlarged view of a part of the cross-sectional structure shown in FIG. 1 (a part on the left side).
- a wafer 30 in which a plurality of devices are built is manufactured by a known method. That is, after performing a required device process on a wafer having a predetermined thickness (for example, a thickness of about 725 ⁇ m in the case of an 8-inch wafer), one side of the wafer (illustrated In this example, a passivation film 13 as a protective film made of silicon nitride (SiN), phosphorous glass (PSG), etc.
- a passivation film 13 as a protective film made of silicon nitride (SiN), phosphorous glass (PSG), etc.
- the portion of the passivation film 13 corresponding to the electrode pad 12 defined by the partial region of the layer is removed (that is, the portion of the passivation film 13 is opened).
- the opening of the passivation film 13 is performed by laser processing such as YAG laser or excimer laser. As a result, the surface is covered with the passivation film 13 and the electrode pad 12 is exposed as shown.
- the insulating film 14 is formed on the passivation film 13 of the wafer 30.
- a photosensitive polyimide resin is applied to the surface of the wafer 30 by photolithography, and a soft beta (pre-beta) treatment of the polyimide resin is performed, followed by exposure and development using a mask (not shown) (polyimide). Resin layer patterning) and hard beta (post-beta) treatment are performed to form an insulating film (polyimide resin layer) 14 having an opening VH at a predetermined location as shown.
- patterning of the polyimide resin layer is performed in accordance with the shape of the electrode pad 12. Therefore, when exposure and development are performed, a portion of the polyimide resin layer 14 corresponding to the electrode pad 12 is removed as shown in the figure, and a via hole (opening VH) reaching the electrode pad 12 is formed.
- a metal thin film 15 is formed by sputtering on the entire surface on the side where the insulating film (polyimide resin layer) 14 is formed.
- the metal thin film 15 has a two-layer structure of a chromium (Cr) layer or a titanium (Ti) layer constituting an adhesion metal layer and a copper (Cu) layer laminated on the adhesion metal layer.
- the metal thin film 15 can be formed by depositing Cr or Ti on the entire surface by sputtering (adhesive metal layer: Cr layer or Ti layer) and further depositing Cu on the entire surface by sputtering (Cu layer). .
- the metal thin film 15 formed in this way functions as a base film (feeding layer) for the electrolytic plating process required in the subsequent rewiring forming process and the metal post forming process.
- dehydration beta is applied to the surface of the metal thin film 15 (Cu layer surface), liquid photoresist is applied and dried, and then the mask (Fig.
- the resist layer R1 is formed by performing exposure and development (photoresist patterning) using a resist layer (not shown). The patterning of the photoresist is performed in accordance with the shape of the rewiring pattern formed in the next step.
- the surface of the metal thin film 15 is used as a power feeding layer, and electrolytic Cu plating is applied to the surface, and the patterned resist layer R1 is used as a mask to redistribute Cu. (Rewiring pattern) 16 is formed.
- the photoresist (resist layer R1) is stripped and removed using a stripping solution containing an organic solvent.
- a photosensitive dry film (thickness of about 100 zm)
- exposure and development patterning of a dry film
- This dry film patterning is performed in accordance with the shape of the metal post formed in the next step.
- the surface of the rewiring layer 16 is subjected to electrolytic Cu plating using the metal thin film 15 as a feeding layer, and the patterned resist layer R2 is used as a mask.
- a Cu post (metal post) 17 is formed on the terminal forming portion of the rewiring layer 16.
- the Cu post 17 has a height of about 100 ⁇ m, which is the same as the thickness of the dry film (resist layer R2).
- a barrier metal layer 18 is formed on the top of the Cu post 17 by electrolytic plating.
- the barrier metal layer 18 is provided with nickel (Ni) plating for improving adhesion on the surface using the Cu post 17 as a power feeding layer, and further, palladium (Pd) plating for improving conductivity on the Ni layer.
- Ni nickel
- Pd palladium
- Au gold
- the Au layer may be formed directly on the Ni layer without providing the Pd layer (Ni / Au).
- the surface on which the rewiring pattern is formed is almost flat.
- the wafer back surface (the lower surface in the illustrated example) is ground using a known grinding apparatus, and the thickness of the wafer 30 is set to a predetermined thickness. (For example, about 250 ⁇ m-300 ⁇ m)
- the pattern surface (upper surface) of the structure manufactured in the previous step is substantially flat, it is easy to chuck the pattern surface side when holding the structure prior to grinding. Become. Therefore, the back surface of the wafer 30 can be ground until it has a predetermined thickness as indicated by an arrow in the drawing in such a chucked state.
- a tape for protecting the surface of the pattern (BG tape) is used in the conventional process when grinding the back surface. ) Is no longer required.
- the surface of the Cu post 17 (barrier metal layer 18) and the surface force S of the dry film (resist layer R2) serve as the conventional BG tape.
- the dry film (resist layer R2) is removed using an alkaline chemical such as sodium hydroxide (NaOH) or monoethanolamine, and then removed. To do.
- an alkaline chemical such as sodium hydroxide (NaOH) or monoethanolamine
- the exposed base is exposed by wet etching.
- the insulating film (polyimide resin layer) 14 is exposed as shown. Thereafter, predetermined surface cleaning or the like is performed.
- an insulating resin layer is provided on the back surface of the wafer 30 for reinforcing and correcting wafer warpage after the resin sealing step. 21 is formed.
- the material of the insulating resin layer 21 for example, thermosetting epoxy resin, polyimide resin, novolac resin, solder resist, or the like is used.
- the insulating resin layer 21 is formed by coating and curing these resins. Alternatively, instead of using these resins, etc., a film-like insulating sheet member can be attached.
- the entire surface of the wafer 30 on which the Cu post 17 is formed is covered (however, the top of the Cu post 17 (barrier metal layer 18)). And is sealed with a sealing resin (formation of the sealing resin layer 19).
- a sealing resin formation of the sealing resin layer 19.
- thermosetting resin for example, epoxy resin
- thermosetting (Cure) to cure the functional resin (within a range of 1 hour to 12 hours). Since the wafer 30 is integrated with the resin film, the resin film is peeled off by the force of the wafer 30. As a result, a wafer 30 whose surface is covered with the sealing resin layer 19 as shown in the drawing and the top of the Cu post 17 (barrier metal layer 18) is exposed is manufactured.
- flux as a surface treatment agent is applied to the top of the exposed Cu post 17 (barrier metal layer 18), and then used as an external connection terminal.
- This is formed by a printing method or ball mounting method and fixed by reflowing at a temperature of about 240 ° C and 260 ° C (solder bump 20 bonding). Then clean the surface to remove the flux.
- the semiconductor device 10 (including the insulating film 14, the sealing resin layer 19, and the insulating resin layer 21) is mounted on a support member (not shown) for dicing, and then a dicer or the like (in the example shown, the blade BL of the dicer 1). ) And cut into individual semiconductor chips (devices). As a result, the semiconductor device 10 (FIG. 1) having the CSP structure according to the present embodiment is manufactured.
- a relatively later stage (Cu post 17 and barrier metal layer 18 are formed in the wafer level package manufacturing process.
- the back surface of the wafer 30 is ground immediately after (see Fig. 4 (b)), and the process up to the formation of the Cu post 17 and the barrier metal layer 18 (Fig. 2 (a)-Fig. 4 (a)).
- the wafer 30 can be processed in a thick state (in this case, a thick wafer state of about 725 ⁇ m), it can be seen in the prior art when thinning the wafer level package. Such occurrence of “wafer cracking” can be prevented.
- the wafer surface (surface on which the pattern is formed) is Cu post 17 (barrier metal layer 18). Since the surface of the substrate and the surface of the dry film (resist layer R2) are almost flat, a thick film type expensive BG tape used in the conventional process is pasted when grinding the backside of the wafer. There is no need. As a result, a dedicated laminator and a dedicated remover (including a peeling tape) are not required at all. This makes it possible to reduce manufacturing costs.
- the back surface of the wafer 30 is ground after the formation of the Cu post 17 and the barrier metal layer 18 by electrolytic plating (before the dry film R2 is peeled off) (FIG. 4 (
- the timing for back grinding is not limited to this point.
- the point is that the surface is almost flat immediately before the back surface grinding of the wafer 30 and can be performed in the manufacturing process of the wafer level package. Only later stages are sufficient.
- the back surface of the wafer 30 may be ground after the formation of the rewiring layer 16 (before the removal of the photoresist R1) (see FIG. 3A).
- the passivation film 13 is not provided, and thereafter
- the insulating film (polyimide resin layer) 14 formed in this step (step in FIG. 2 (b)) may also function as a passivation film. Or conversely, only the passivation film 13 may be provided without providing the insulating film 14.
- a photosensitive polyimide resin is used as the insulating film 14 formed on the surface of the wafer 30 in the step of FIG. 2B .
- a resin such as a non-photosensitive polyimide resin or an epoxy resin may be used.
- an insulating resin layer 21 for reinforcing and correcting the warpage of the wafer is formed on the back surface of the wafer.
- the insulating resin layer 21 is not necessarily formed, and this step may be omitted depending on the case.
- FIG. 6 schematically shows a cross-sectional structure of a semiconductor device having a CSP structure according to the second embodiment of the present invention.
- the semiconductor device 10a according to the second embodiment is exposed on the back surface of the silicon substrate 11a as compared to the semiconductor device 10 according to the first embodiment described above (FIG. 1). It is different.
- a reinforcing insulation tree formed on the back surface of the wafer in order to cope with a wafer crack in the course of the wafer level package manufacturing process.
- the oil layer 21 is left as it is (see FIG. 5), and the semiconductor device 10 is formed.
- the second embodiment as a countermeasure against wafer cracking during the manufacturing process, as in the first embodiment.
- the film layer formed on the back surface of the wafer in the course of the manufacturing process has a wafer function when heat treatment such as thermosetting of the sealing resin is performed in addition to a function for reinforcement for preventing wafer cracking. It also has a function to prevent the warpage of the wafer (a function to correct the warpage of the wafer).
- the material, thickness, and form of the film layer will be described as appropriate in the manufacturing method described later.
- a wafer 30a whose surface is covered with the passivation film 13 and the electrode pad 12 is exposed is manufactured.
- An insulating film (polyimide resin layer) 14 is formed on the passivation film 13
- a metal thin film 15 is formed on the electrode pad 12 and the insulating film 14, and Cu is redistributed on the surface of the metal thin film 15 as a power feeding layer.
- a layer 16 is formed, and a Cu post (metal post) 17 and a barrier metal layer 18 are formed on the terminal formation portion of the rewiring layer 16 using the patterned dry film (resist layer R2) as a mask.
- the back surface of the wafer is ground by a grinding device in the same manner as the processing performed in the step of FIG. 4 (b), and the thickness of the wafer 30a is set to a predetermined value. Reduce the thickness (for example, about 200 zm).
- the back surface of the thinned wafer 30a is marked with a CO laser. In other words, information such as the serial number and customer company name is written for each device.
- a predetermined thickness eg, about 70-290 ⁇ m
- the film layer 22 is formed.
- a tape having heat resistance (about 240 ° C. at the maximum) and chemical resistance hereinafter referred to as “heat-resistant tape” for convenience) is used as the film layer 22.
- the heat-resistant tape 22 has a multilayer structure in which an adhesive or the like is applied on a base material such as a PET film, and is attached to the back surface of the wafer 30a via the adhesive layer.
- the heat-resistant tape 22 is a tape having a property of hardening in response to ultraviolet (UV) irradiation (that is, a type that is peeled off by UV irradiation).
- UV ultraviolet
- the reason why this heat-resistant tape 22 requires “chemical resistance” is that it is necessary to use an alkaline chemical for stripping the dry film (resist layer R2) in the subsequent process, and it is exposed. This is because it is necessary to use an acidic or alkaline etching solution to remove the metal base film (metal thin film 15), and it is necessary to withstand these chemical solutions.
- the dry film (resist layer R2) is stripped and exposed in the same manner as the processing performed in the steps of FIGS. 4 (c) and (d). Remove the stubborn base film (metal thin film 15).
- the heat-resistant tape 22 attached to the back surface of the wafer 30a is irradiated with ultraviolet rays (UV).
- UV ultraviolet rays
- This UV irradiation amount is set to an irradiation amount that is sufficient to cure the adhesive layer constituting the heat-resistant tape 22 to some extent and is not so great. The reason for UV irradiation at this stage will be explained later.
- the entire surface of the wafer 3 Oa on the side where the Cu post 17 is formed is covered in the same manner as the processing performed in the step of FIG. 5B. (However, the top of the Cu post 17 (barrier metal layer 18) is exposed) and sealed with a sealing resin.
- the semiconductor wafer 30a to which the solder bumps 20 are bonded is placed on the dicing tape 41 supported by the dicing frame 40. Adhere the surface on which the heat-resistant tape 22 of a is affixed. Further, the semiconductor wafer 30a is cut along a line defining a region of each device by a dicer or the like (in the illustrated example, a blade BL of a dicer). At this time, as shown by the broken line in the figure, the cut is made to the middle of the heat-resistant tape 22. As a result, the semiconductor wafer 30a is divided into individual semiconductor chips (devices) with the heat-resistant tape 22 attached.
- each semiconductor chip (device) 10a cut and divided in the previous step is picked up.
- the heat-resistant tape 22 adhered to the back surface of the semiconductor wafer 30a is completely peeled off from the back surface of the wafer while being adhered onto the dicing tape 41. This is because the heat resistant tape 22 is preliminarily irradiated with UV (FIG. 8 (b)).
- the heat-resistant tape 22 has a multilayer structure in which an adhesive or the like is applied on a base material (PET film) as described above, and this adhesion is finally performed when a pickup process is performed. There is no problem if the agent layer is peeled off from the backside of the wafer with the adhesive layer completely attached to the substrate, but UV irradiation is not necessary.
- the adhesive layer will be altered, so that part of the adhesive layer will stick to the back of the wafer during pick-up.
- the heat-resistant tape 22 cannot be removed cleanly. Therefore, UV irradiation is performed at the stage before heat treatment as in the present embodiment, and the adhesive layer is allowed to be cured to some extent, so that the adhesive is finally taken up when the pickup process is performed.
- the heat-resistant tape 22 can be peeled cleanly from the backside of the wafer with the layer completely attached to the substrate.
- the amount of UV irradiation becomes excessive, the heat-resistant tape 22 may be peeled off at that stage due to the impact of any force or the like during the pickup process. The amount needs to be set to an appropriate amount.
- the wafer 30a is ground at a relatively later stage (the stage immediately after the formation of the Cu post 17 and the barrier metal layer 18) (see FIG. 7 (a)).
- a heat resistant tape having a predetermined thickness on the backside of the wafer 30a 22 Since this is pasted (see Fig. 7 (c)), the heat-resistant tape 22 functions as a reinforcing film layer against wafer cracking after this step.
- the heat-resistant tape 22 attached to the back surface of the wafer 30a does not warp the wafer 30a when heat treatment such as resin sealing and thermosetting (curing) is performed at a later stage.
- the wafer can be completely peeled off from the backside of the wafer at the stage of the final pick-up process.
- the heat-resistant tape 22 attached to the back surface of the wafer for warping correction can be finally removed, there is no need to leave it as a permanent film as in the prior art.
- it is not necessary to perform various reliability tests such as adhesion reliability tests with the wafer), and there is no problem of peeling between the permanent film (film layer) and the back surface of the chip.
- the heat-resistant tape 22 is formed by using a type that peels off after being applied with UV (a so-called “UV peeling type”).
- UV peeling type a type that peels off after being applied with UV
- the force S explained to us, and the form of heat-resistant tape used is not limited to this.
- it is possible to use a type that heats and peels off without applying UV so-called “thermal peeling type”. This is a meritka S, which is cheaper than the UV peeling type.
- the heat-peeling type tape can be peeled by applying a peeling force by reducing its adhesive strength by applying heat of, for example, about 50-60 ° C.
- the point to be noted here is the point that cannot be peeled off simply by applying heat.
- perform curing Fig. 8 (c)
- the force that will cause reflow Fig. 8 (d)
- Fig. 9 (b) the final pick-up process
- the tape can be peeled from the backside of the wafer by applying a force to peel each device from the tape. For this reason, a heating mechanism for heating to the predetermined temperature is required at the stage of the pickup process.
- FIG. 10 shows a part of the manufacturing process of the semiconductor device according to the third embodiment of the present invention
- FIG. 11 explains the processing of the wafer edge portion performed in the process of FIG. 10 (b). It is a figure to do.
- the resin (19) diffuses to the outer peripheral portion of the wafer 30, and the diffused resin protrudes to the wafer edge portion and goes around the wafer back surface. If the wafer backside grinding process is performed in this state, there is a risk of wafer cracking as described above.
- the back surface of the wafer is ground by a grinding device in the same manner as the process performed in the step of FIG. 4 (b), and the wafer 30 is thinned to a predetermined thickness.
- solder bumps 20 are bonded to the tops of exposed Cu posts 17 (barrier metal layer 18), and wafer 30 (including insulating film 14 and sealing resin layer 19) is diced. Into individual semiconductor chips (devices).
- the wafer edge portion does not protrude. Since the wafer backside grinding process is performed after the resin layer 19 has been removed, it has not been possible to achieve this until now without causing the wafer cracking due to the protrusion of the resin as seen in the prior art. Wafer backside grinding after the resin sealing process can be realized. As a result, almost all processes can be made to flow in a thick wafer state, so that there is less risk of wafer cracking than in the case of making a thick wafer state flow until the middle of the manufacturing process as in the first embodiment. It becomes possible to further reduce
- the unnecessary protrusion of the resin is unnecessary.
- the method for cutting (removing) the resin layer 19 has been described as an example, the method for solving the problem of the resin protrusion at the wafer edge portion is not limited to this.
- a method may be adopted in which the resin diffused on the outer peripheral portion of the wafer during resin sealing stays at the wafer edge portion and does not go around the wafer back surface.
- Figure 12 illustrates the method in that case.
- a U-shaped groove G is formed in a ring shape along the wafer edge portion on the surface of the wafer 30 on which the Cu post 17 (barrier metal layer 18) is formed.
- This U-shaped groove G uses a circular dicing method as illustrated in FIG. 11 in combination with a profile force that vibrates the shape of the blade BL of the dicer. And can be formed. In the example shown in the figure, it is a U-shaped groove G.
- the cross-sectional shape of the groove to be formed is not limited to the “U-shaped”, for example, a V-shaped, rectangular, or other shape. May be.
- the wafer is processed in the same manner as the processing performed in the step of FIG. 5 (b).
- 30 Cu posts 17 are formed and sealed with a sealing resin 19 so as to cover the entire surface on the opposite side (however, the top of the Cu posts 17 (barrier metal layer 18) is exposed).
- the resin 19 diffused in the outer peripheral portion of the wafer 30 is dropped into the U-shaped groove G formed in the wafer edge portion.
- the back surface of the wafer is ground by a grinding device to thin the wafer 30 to a predetermined thickness, and a solder bump is formed on the top of the exposed Cu post 17 (barrier metal layer 18).
- the wafer 30 (including the insulating film 14 and the sealing resin layer 19) is diced and divided into individual semiconductor chips (devices).
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- Manufacturing & Machinery (AREA)
- Physics & Mathematics (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- General Physics & Mathematics (AREA)
- Mechanical Treatment Of Semiconductor (AREA)
- Internal Circuitry In Semiconductor Integrated Circuit Devices (AREA)
Abstract
Description
Claims
Priority Applications (3)
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PCT/JP2004/010205 WO2006008795A1 (ja) | 2004-07-16 | 2004-07-16 | 半導体装置の製造方法 |
CNB2004800207675A CN100395886C (zh) | 2004-07-16 | 2004-07-16 | 半导体器件的制造方法 |
US11/102,967 US7811857B2 (en) | 2004-07-16 | 2005-04-12 | Method of manufacturing semiconductor device |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
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PCT/JP2004/010205 WO2006008795A1 (ja) | 2004-07-16 | 2004-07-16 | 半導体装置の製造方法 |
Related Child Applications (1)
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US11/102,967 Continuation US7811857B2 (en) | 2004-07-16 | 2005-04-12 | Method of manufacturing semiconductor device |
Publications (1)
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WO2006008795A1 true WO2006008795A1 (ja) | 2006-01-26 |
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Family Applications (1)
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PCT/JP2004/010205 WO2006008795A1 (ja) | 2004-07-16 | 2004-07-16 | 半導体装置の製造方法 |
Country Status (3)
Country | Link |
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US (1) | US7811857B2 (ja) |
CN (1) | CN100395886C (ja) |
WO (1) | WO2006008795A1 (ja) |
Families Citing this family (26)
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CN100395886C (zh) * | 2004-07-16 | 2008-06-18 | 新光电气工业株式会社 | 半导体器件的制造方法 |
WO2006054606A1 (ja) * | 2004-11-16 | 2006-05-26 | Rohm Co., Ltd. | 半導体装置および半導体装置の製造方法 |
KR100698098B1 (ko) * | 2005-09-13 | 2007-03-23 | 동부일렉트로닉스 주식회사 | 반도체 소자의 제조방법 |
CN101278394B (zh) * | 2005-10-03 | 2010-05-19 | 罗姆股份有限公司 | 半导体装置 |
JP4895594B2 (ja) * | 2005-12-08 | 2012-03-14 | 株式会社ディスコ | 基板の切削加工方法 |
JP5054954B2 (ja) * | 2006-09-22 | 2012-10-24 | ルネサスエレクトロニクス株式会社 | 半導体装置の製造方法 |
DE102007023666A1 (de) * | 2006-12-01 | 2008-06-05 | Infineon Technologies Ag | Halbleiterbaustein und Verfahren zur Herstellung eines Halbleiterbausteins |
US7851333B2 (en) * | 2007-03-15 | 2010-12-14 | Infineon Technologies Ag | Apparatus comprising a device and method for producing it |
JP5337404B2 (ja) * | 2008-05-21 | 2013-11-06 | ローム株式会社 | 半導体装置および半導体装置の製造方法 |
US7928534B2 (en) | 2008-10-09 | 2011-04-19 | Taiwan Semiconductor Manufacturing Company, Ltd. | Bond pad connection to redistribution lines having tapered profiles |
US8736050B2 (en) * | 2009-09-03 | 2014-05-27 | Taiwan Semiconductor Manufacturing Company, Ltd. | Front side copper post joint structure for temporary bond in TSV application |
US8531015B2 (en) * | 2009-03-26 | 2013-09-10 | Stats Chippac, Ltd. | Semiconductor device and method of forming a thin wafer without a carrier |
US8759949B2 (en) * | 2009-04-30 | 2014-06-24 | Taiwan Semiconductor Manufacturing Company, Ltd. | Wafer backside structures having copper pillars |
CN102280433B (zh) * | 2011-08-19 | 2013-04-17 | 苏州晶方半导体科技股份有限公司 | 晶圆级芯片尺寸封装结构及其封装方法 |
CN103035520A (zh) * | 2012-08-13 | 2013-04-10 | 上海华虹Nec电子有限公司 | Igbt器件的制作方法 |
JP6054234B2 (ja) * | 2013-04-22 | 2016-12-27 | 株式会社ディスコ | ウエーハの加工方法 |
US20150371956A1 (en) * | 2014-06-19 | 2015-12-24 | Globalfoundries Inc. | Crackstops for bulk semiconductor wafers |
KR101959488B1 (ko) * | 2015-09-08 | 2019-03-18 | 주식회사 엘지화학 | 광학 소자의 제조 방법 |
US9711367B1 (en) * | 2016-06-01 | 2017-07-18 | Taiwan Semiconductor Manufacturing Co., Ltd. | Semiconductor method with wafer edge modification |
US9768072B1 (en) * | 2016-06-30 | 2017-09-19 | International Business Machines Corporation | Fabrication of a vertical fin field effect transistor with reduced dimensional variations |
CN106376180A (zh) * | 2016-08-16 | 2017-02-01 | 上海交通大学 | 基于金属牺牲层工艺的弹性电路制备方法 |
JP6843570B2 (ja) * | 2016-09-28 | 2021-03-17 | キヤノン株式会社 | 半導体装置の製造方法 |
KR102634946B1 (ko) * | 2016-11-14 | 2024-02-07 | 삼성전자주식회사 | 반도체 칩 |
JP6770443B2 (ja) * | 2017-01-10 | 2020-10-14 | ルネサスエレクトロニクス株式会社 | 半導体装置の製造方法および半導体ウェハ |
CN111279496A (zh) * | 2017-08-04 | 2020-06-12 | 欧司朗光电半导体有限公司 | 用于制造光电子半导体器件的方法 |
US20210375816A1 (en) * | 2020-06-02 | 2021-12-02 | Texas Instruments Incorporated | Ic device with chip to package interconnects from a copper metal interconnect level |
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JP2000068401A (ja) * | 1998-08-18 | 2000-03-03 | Oki Electric Ind Co Ltd | 半導体装置およびその製造方法 |
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JP2002270720A (ja) * | 2001-03-09 | 2002-09-20 | Matsushita Electric Ind Co Ltd | 半導体装置およびその製造方法 |
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CN100395886C (zh) * | 2004-07-16 | 2008-06-18 | 新光电气工业株式会社 | 半导体器件的制造方法 |
-
2004
- 2004-07-16 CN CNB2004800207675A patent/CN100395886C/zh not_active Expired - Fee Related
- 2004-07-16 WO PCT/JP2004/010205 patent/WO2006008795A1/ja active Application Filing
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JP2000068401A (ja) * | 1998-08-18 | 2000-03-03 | Oki Electric Ind Co Ltd | 半導体装置およびその製造方法 |
JP2000228412A (ja) * | 1999-02-05 | 2000-08-15 | Sanyo Electric Co Ltd | 半導体装置の製造方法 |
JP2001168231A (ja) * | 1999-12-13 | 2001-06-22 | Matsushita Electronics Industry Corp | 半導体装置およびその製造方法 |
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CN1826688A (zh) | 2006-08-30 |
CN100395886C (zh) | 2008-06-18 |
US7811857B2 (en) | 2010-10-12 |
US20060014320A1 (en) | 2006-01-19 |
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